PriorValue

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protected override void OnMarketData(MarketDataEventArgs marketDataUpdate)
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{
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   if (marketDataUpdate.MarketDataType == MarketDataType.Last)
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   {
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       CurrentValue = marketDataUpdate.Price;
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       // Trigger an alert if the current Last price update is greater than the previous one
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       if(CurrentValue > PriorValue)
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           Alert("MA Alert", Priority.High, "Check Market Analyzer", "", 30, Brushes.Black, Brushes.White);
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   }
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}